![]() If you want to give the whole word, you need to look for lines starting with user1 directly: user1. Most engines: 'word character': ASCII letter, digit or underscore. filedd.NET, Python 3: one Unicode digit in any script. For easy navigation, here are some jumping points to various sections of the page: More White-Space Anchors and Boundaries (direct link) Most engines: one digit. is a regular expression operator that matches any character). Regex Accelerated Course and Cheat Sheet. would be the equivalent of: grep 'user1example\.com' textfile. That means 'match lines that start with any character other than or, and then the sting ser1. See the -F (fixed string, as opposed to regular expression) and -x (exact: match the whole line) options.
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